What does "[6 Euro 4]" mean in car ads?

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Joined
6 Jun 2004
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2,389
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London
Just been browsing Autotrader - the mondeos have a 5 gear and a 6 gear version and I assume the [6] in the advert indicates that this is a 6 gear version.
Some of them, however, have [6 Euro 4] in the title and I have no idea what this means.

Can anyone shed any light?

Cheers
 
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